Remove reference to projections (#2336)

Changes from microsoft/typespec#6327

.chronus/changes/remove-projections-2025-2-7-19-30-56.md

@@ -0,0 +1,9 @@
+---
+# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
+changeKind: feature
+packages:
+  - "@azure-tools/typespec-autorest"
+  - "@azure-tools/typespec-azure-core"
+---
+
+Remove reference to deleted projection feature

packages/typespec-autorest/src/openapi.ts

@@ -466,8 +466,7 @@ export async function getOpenAPIForService(
         prop.type.kind === "Scalar" &&
         ignoreDiagnostics(
           program.checker.isTypeAssignableTo(
-            // eslint-disable-next-line @typescript-eslint/no-deprecated
-            prop.type.projectionBase ?? prop.type,
+            prop.type,
             program.checker.getStdType("url"),
             prop.type,
           ),
@@ -759,8 +758,7 @@ export async function getOpenAPIForService(
   }
 
   function isBytes(type: Type) {
-    // eslint-disable-next-line @typescript-eslint/no-deprecated
-    const baseType = type.projectionBase ?? type;
+    const baseType = type;
     return ignoreDiagnostics(
       program.checker.isTypeAssignableTo(baseType, program.checker.getStdType("bytes"), type),
     );
@@ -1106,8 +1104,6 @@ export async function getOpenAPIForService(
 
   function getJsonName(type: Type & { name: string }): string {
     const encodedName = resolveEncodedName(program, type, "application/json");
-    // Pick the value set via `encodedName` or default back to the legacy projection otherwise.
-    // `resolveEncodedName` will return the original name if no @encodedName so we have to do that check
     return encodedName === type.name ? type.name : encodedName;
   }
 

packages/typespec-azure-core/test/test-host.ts

@@ -1,11 +1,5 @@
-import {
-  Diagnostic,
-  listServices,
-  Model,
-  Namespace,
-  Program,
-  projectProgram,
-} from "@typespec/compiler";
+import { Diagnostic, listServices, Model, Namespace, Program } from "@typespec/compiler";
+import { unsafe_mutateSubgraphWithNamespace } from "@typespec/compiler/experimental";
 import { BasicTestRunner, createTestHost, createTestWrapper } from "@typespec/compiler/testing";
 import {
   getAllHttpServices,
@@ -17,8 +11,9 @@ import {
 import { HttpTestLibrary } from "@typespec/http/testing";
 import { OpenAPITestLibrary } from "@typespec/openapi/testing";
 import { RestTestLibrary } from "@typespec/rest/testing";
-import { buildVersionProjections } from "@typespec/versioning";
+import { getVersioningMutators } from "@typespec/versioning";
 import { VersioningTestLibrary } from "@typespec/versioning/testing";
+import { strictEqual } from "assert";
 import { AzureCoreTestLibrary } from "../src/testing/index.js";
 
 export async function createAzureCoreTestHost() {
@@ -118,12 +113,19 @@ export async function getSimplifiedOperations(
 
 export function getServiceForVersion(program: Program, version: string): Namespace {
   const services = listServices(program);
-  const versions = buildVersionProjections(program, services[0].type);
-  const versionRecord = versions.find((v) => v.version === version);
+  const result = getVersioningMutators(program, services[0].type);
+  strictEqual(result?.kind, "versioned");
+  const snapshot = result.snapshots.find(
+    (v) => v.version.value === version || v.version.name === version,
+  );
 
-  if (versionRecord) {
-    const projectedProgram = projectProgram(program, versionRecord.projections);
-    return projectedProgram.projector.projectedTypes.get(services[0].type) as Namespace;
+  if (snapshot) {
+    const subgraph = unsafe_mutateSubgraphWithNamespace(
+      program,
+      [snapshot.mutator],
+      services[0].type,
+    );
+    return subgraph.type as Namespace;
   }
 
   throw new Error(`Version '${version}' not found!`);